Flake8 fixes.

awx/api/views.py

@@ -577,7 +577,7 @@ class AuthTokenView(APIView):
             # Always remove read only fields from serializer.
             for name, field in serializer.fields.items():
                 if getattr(field, 'read_only', None):
-                     del serializer.fields[name]
+                    del serializer.fields[name]
             serializer._data = self.update_raw_data(serializer.data)
         return serializer